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Excited atomic states are produced by electron impact with a pulsed beam of electrons of fixed energy and sharp cut-off. The spontaneous decay of these states is obtained as a function of time by a single-photon counting technique. Experimental values for the lifetimes of the 4 3S, 5 3S, 4 1S, 5 1S, 3 3P, 4 3P, 3 1P, 4 1D and 5 1D states of neutral helium are given.
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Bridgett et al. (1967) studied this question.
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